development of armoured vehicles

...and was considerably lighter. The M113 was the first aluminum-armoured vehicle to be put into large-scale production. After its appearance, several other armoured carriers, light tanks, and
self-propelled guns were built with aluminum armour. Within 30 years the United States had produced more than 76,000 M113 APCs and their derivatives, making them the most numerous armoured vehicles...

...century that armoured fighting vehicles began to take practical form. By then the basis for them had become available with the appearance of the traction engine and the automobile. Thus, the first self-propelled armoured vehicle was built in 1900 in England when John Fowler & Company armoured one of their steam traction engines for hauling supplies in the South African (Boer) War...

...developed other heavy vehicles for this purpose, such as the 128-mm-gun Jagdtiger and the 122-mm-gun ISU, which in effect were turretless tanks. In addition, all armies developed lightly armoured self-propelled antitank guns. The U.S. Army developed a specialized category of tank destroyers that resembled
self-propelled guns in being relatively lightly armoured but that, like tanks, had...